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United States Patent | 5,213,749 |
Huss ,   et al. | May 25, 1993 |
A method of forming a rubber seal containing a metal insert where a transfer mold having a cavity is provided with a post and a plurality of upwardly extending arcuated bosses on the base of the cavity. A metallic insert is disposed on the bosses and a flowable rubber material forced into the mold cavity and envelopes the metallic insert to form the rubber ring seal. The rubber seal produced has a plurality of spaced, aligned arcuate grooves in a flat planar surface of the base extending inwardly towards the embedded metallic insert.
Inventors: | Huss; Howard D. (Westmoreland City, PA); Greenaway; William G. (North Huntington, PA); Streitman; Lawrence R. (Pittsburgh, PA) |
Assignee: | Westinghouse Air Brake Company (Wilmerding, PA) |
Appl. No.: | 739121 |
Filed: | July 31, 1991 |
Current U.S. Class: | 264/275; 264/273; 264/279.1; 264/328.4; 425/129.1 |
Intern'l Class: | B29C 033/12; B29C 033/30; B29C 045/02 |
Field of Search: | 264/271.1,274,275,279.1,328.4,331.13,336,273,277 425/544,129.1 |
2951004 | Aug., 1960 | Martin et al. | 264/266. |
2985919 | May., 1961 | Borroff et al. | 264/275. |
3345077 | Oct., 1967 | Novosad | 264/274. |
4038359 | Jul., 1977 | Pendleton | 264/274. |
4443396 | Apr., 1984 | Breher | 264/275. |
4835840 | Jun., 1989 | Stokes | 264/274. |
5020207 | Jun., 1991 | Minoda | 264/274. |
Foreign Patent Documents | |||
58-222814 | Dec., 1983 | JP | 264/328. |